Eonwe was indeed the mightiest in arms of all Arda, meaning that NO-ONE could have withstood him in battle (not even the Valar, according to the wording). But of course might in arms does not necesarily mean you are the most gifted. After all Sauron was a very gifted Maia in terms of craftwork albeit evil.
I think the whole point of the War of Wrath was to win back the Silmarils which they failed in. For this Eonwe can only be blamed. He set a guard on them yes, but why didn't Eowne specifically guard them himself (after all he is the mightiest in arms of all Arda) or at least send them back to Valinor straight away with a heavily armed escort. Instead he let Maedhros and Maglor get away (why couldnt he just chuck a net over them like Gothmog did to Hurin).
By the way, can someone tell me how Maedhros could carry a sword and a Silmaril when he had only one hand. It is said that when the camp was raised against them, "they prepared to die, defending themselves to the last."
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